1 Select the reactants or groups with low Ea under the same conditions;
2 change the reaction process.
Fig.1 Sketch of chemical reaction energy change 2. Basic properties of YH2800 series adhesives 1Physical andchemical properties The basic physicochemical properties of YH2800 series adhesives are shown in Table 2.
2 Diluent The solvent that can be used in this adhesive is ethyl acetate, acetone, methyl ethyl ketone, etc. Ethyl acetate is recommended. When manufacturing high-quality composite membranes, the solvent moisture content must not exceed 300 ppm.
3 ratio of standard ratio (weight ratio):
YH2800:YH15=100:8
YH2800A:YH15=4:1
YH2800B:YH15=5:1
4 Precautions for Use Dilution: Be sure to add the solvent to the main agent, mix thoroughly, add the curing agent, and stir it before use. Coating weight: The dry coating weight can be selected between 20-40 g/m2. Composite films that require hot or deep processing require a large amount of coating, whereas a smaller amount of coating results. For the printed film, the coating amount should also be increased appropriately. Working concentration: YH2800 is generally recommended to use a concentration of 25% to 35%, and YH2800A or YH2800B is generally recommended to use a concentration of 30% to 40%. The remaining glue can be mixed with Gaomeng YH2000 series.
Ripening: The composite product should be aged at 50°C±5°C, aged 4H～8H, and cured by natural aging at a normal temperature of not less than 25°C for 12H.
3, open time, also known as the plate life, refers to the two-component glue liquid ratio of working time after the operating time. YH2800 and YH15 are blended at 30% concentration, YH2800A and YH15 are blended at 35% concentration, YH2800B and YH15 are blended at 30% concentration, foreign A is formulated at 30% concentration, foreign B is formulated at 30% concentration, and the viscosity is measured using a 3# cup. (S) See Table 3 for changes over time.
Viscosity/S
——YH2800
——YH2800A
——YH2800B
- Foreign A
- Foreign B
Figure 2 several adhesive viscosity - time relationship (slightly
At 25 °C, RH 50% conditions, the glue 24H clear and transparent. Note: The glue is placed in a closed container. The ambient temperature, humidity, the concentration of the formulated adhesive, the quantity, and the status of the container all affect the life of the disk. Therefore it is recommended to use up within 8H, in the higher operating concentration or relatively high temperature and humidity conditions, should be a small amount of adhesive preparation, and should be used as soon as possible.
4. Initial adhesion composite structure: NY25/transparent PE60, and NY30/milk white PE90 sizing amount: 2~3g/m2NY25/transparent PE105, sizing amount: 35~45g/m2 Unit N/15mm. The initial tack test results of several adhesives are shown in Table 4. It can be seen from the table that the YH2800 series' initial tack force is comparable to that of similar foreign products and is much higher than that of ordinary type adhesives.
5, the impact of the amount of coating film composite effect is good or bad, and adhesive coating amount is very large. The effect of coating weight on NY25/PE90 peel strength is shown in Table 5 below. When the requirement for the composite strength is high, it is recommended that the coating amount be 3 g/m 2 or more.
6. The impact of aging time was reflected by customers. Some fast-curing adhesives had a prolonged aging time and the peeling strength had a decreasing trend. Changes in maturation time of YH2800 series adhesives are shown in Table 6 below. The amount of glue 20 ~ 30g/m2. As can be seen from the table, the peeling strength hardly changed after aging 4H and aging 72H.
7. Performance comparison The performance comparison of YH2800 series fast-curing adhesive and YH200 series is shown in the table below. The unit N/15mm has been developed through the adhesive composition, molecular structure, molecular weight distribution design and control, developed a fast curing adhesive with excellent performance; this series of adhesives can significantly shorten the curing time, and with the prolonged aging time, the peel strength of the composite film is not Changes; for plastic / plastic composite has a suitable opening time, good initial tack, excellent peel strength.
2 change the reaction process.
Fig.1 Sketch of chemical reaction energy change 2. Basic properties of YH2800 series adhesives 1Physical andchemical properties The basic physicochemical properties of YH2800 series adhesives are shown in Table 2.
2 Diluent The solvent that can be used in this adhesive is ethyl acetate, acetone, methyl ethyl ketone, etc. Ethyl acetate is recommended. When manufacturing high-quality composite membranes, the solvent moisture content must not exceed 300 ppm.
3 ratio of standard ratio (weight ratio):
YH2800:YH15=100:8
YH2800A:YH15=4:1
YH2800B:YH15=5:1
4 Precautions for Use Dilution: Be sure to add the solvent to the main agent, mix thoroughly, add the curing agent, and stir it before use. Coating weight: The dry coating weight can be selected between 20-40 g/m2. Composite films that require hot or deep processing require a large amount of coating, whereas a smaller amount of coating results. For the printed film, the coating amount should also be increased appropriately. Working concentration: YH2800 is generally recommended to use a concentration of 25% to 35%, and YH2800A or YH2800B is generally recommended to use a concentration of 30% to 40%. The remaining glue can be mixed with Gaomeng YH2000 series.
Ripening: The composite product should be aged at 50°C±5°C, aged 4H～8H, and cured by natural aging at a normal temperature of not less than 25°C for 12H.
3, open time, also known as the plate life, refers to the two-component glue liquid ratio of working time after the operating time. YH2800 and YH15 are blended at 30% concentration, YH2800A and YH15 are blended at 35% concentration, YH2800B and YH15 are blended at 30% concentration, foreign A is formulated at 30% concentration, foreign B is formulated at 30% concentration, and the viscosity is measured using a 3# cup. (S) See Table 3 for changes over time.
Viscosity/S
——YH2800
——YH2800A
——YH2800B
- Foreign A
- Foreign B
Figure 2 several adhesive viscosity - time relationship (slightly
At 25 °C, RH 50% conditions, the glue 24H clear and transparent. Note: The glue is placed in a closed container. The ambient temperature, humidity, the concentration of the formulated adhesive, the quantity, and the status of the container all affect the life of the disk. Therefore it is recommended to use up within 8H, in the higher operating concentration or relatively high temperature and humidity conditions, should be a small amount of adhesive preparation, and should be used as soon as possible.
4. Initial adhesion composite structure: NY25/transparent PE60, and NY30/milk white PE90 sizing amount: 2~3g/m2NY25/transparent PE105, sizing amount: 35~45g/m2 Unit N/15mm. The initial tack test results of several adhesives are shown in Table 4. It can be seen from the table that the YH2800 series' initial tack force is comparable to that of similar foreign products and is much higher than that of ordinary type adhesives.
5, the impact of the amount of coating film composite effect is good or bad, and adhesive coating amount is very large. The effect of coating weight on NY25/PE90 peel strength is shown in Table 5 below. When the requirement for the composite strength is high, it is recommended that the coating amount be 3 g/m 2 or more.
6. The impact of aging time was reflected by customers. Some fast-curing adhesives had a prolonged aging time and the peeling strength had a decreasing trend. Changes in maturation time of YH2800 series adhesives are shown in Table 6 below. The amount of glue 20 ~ 30g/m2. As can be seen from the table, the peeling strength hardly changed after aging 4H and aging 72H.
7. Performance comparison The performance comparison of YH2800 series fast-curing adhesive and YH200 series is shown in the table below. The unit N/15mm has been developed through the adhesive composition, molecular structure, molecular weight distribution design and control, developed a fast curing adhesive with excellent performance; this series of adhesives can significantly shorten the curing time, and with the prolonged aging time, the peel strength of the composite film is not Changes; for plastic / plastic composite has a suitable opening time, good initial tack, excellent peel strength.
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